title: Concept for E.coli detection using interdigitated microelectrode impedance sensor.
abstract: This paper presents the concept to detect Escherichia coli O157:H7 based on electrochemical impedance spectroscopy at interdigitated microelectrode. Interdigitated microelectrode structures was designed and fabricated, with glass as substrate material and gold electrodes. The performance of the sensors was studied by measuring the capacitance in air and impedance spectra in DI water. The feasibility of the fabricated sensor for detecting different concentrations of Escherichia coli in water was demonstrated. Electrochemical impedance spectroscopy (EIS) was employed as the detection technique. The impedance based response significant change for different E.coli concentrations in the frequency range between 1 kHz to 100 kHz.
authors.forename: Kalpana
authors.initials: K
authors.lastname: Settu
authors.forename: Jen-Tsai
authors.initials: JT
authors.lastname: Liu
authors.forename: Ching-Jung
authors.initials: CJ
authors.lastname: Chen
authors.forename: Jang-Zern
authors.initials: JZ
authors.lastname: Tsai
authors.forename: Shwu Jen
authors.initials: SJ
authors.lastname: Chang
mesh_terms: D058266:Dielectric Spectroscopy / Q000295:instrumentation; D017097:Electric Impedance; D019453:Escherichia coli O157; D006046:Gold / Q000737:chemistry; D008839:Microelectrodes; D014871:Water Microbiology
chemical_list: D006046:Gold